So i was reading some threads about Cab Mount Chops and out of no where someone said he regrets getting aftermarket UCA because he couldnt be able to do a full U-turn. I dont know if I mis understood what i read or this is actually true.

Probably a miscommunication of cause and effect. The poster probably had larger tires. The aftermarket UCA corrects caster, which moves the tire slightly closer to the rear compared to the stock UCA. It just means he would have to trim and chop more to get the needed tire clearance. The fender/body mount should never be used as a steering stop!

KenLyns nailed it then, it's not the aftermarket UCA, it's a combination of things.

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ohh okay thanks i kinda got scared when i read that i was was second guessing myself but was wondering if it the truck wasnt able to do something as simple as a U turn why would you but after market UCA and wheel with them silly mmee